<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>外部样式</title>
  <!-- 导入外部的css文件 -->
  <link rel="stylesheet" href="./css/index.css">
</head>

<body>
  <div>我是一个div标签</div>
  <p>我是一个段落标签</p>
</body>

</html>